This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process which may lead to differences between this version and the Version of Record. Please cite this article as doi: 10.1002/dmrr.2868 This article is protected by copyright. All rights reserved. Diabetes mellitus and long-term mortality of ovarian cancer patients. A systematic review and meta-analysis of 12 cohort studies Dongyu Zhang 1 ; Yuan Zhao 2 ; Tengteng Wang 1 ; Yuzhi Xi 1 ; Nan Li 1 ; Hongtai Huang 3 Affiliations: Department of Epidemiology, University of North Carolina at Chapel Hill Gillings School of Global Public Health 1 , Chapel Hill, NC, USA Department of Infectious Disease, Johns Hopkins University School of Medicine 2 , Baltimore, MD, USA Department of Geography and Environmental Engineering, Johns Hopkins University Whiting School of Engineering 3 , Baltimore, MD, USA Running title: Diabetes and ovarian cancer mortality Word count: main text: 3,991, abstract: 242 Address all correspondence to: Dongyu Zhang Department of Epidemiology, University of North Carolina at Chapel Hill Gillings School of Global Public Health 170 Rosenau Hall, CB #7400 | 135 Dauer Drive | Chapel Hill, NC 27599‑7400 Phone: 443-799-7713; Email: dzhang34@live.unc.edu Number of tables: 3; Number of figure: 3 Keywords: Ovarian cancer, Diabetes mellitus, Mortality, Systematic review and meta- analysis